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Just call the following command to get the currently highest value of E1XXX codes here in the doc. E1XXX only, because the E4321 is used as example below.
php -r '$text = file_get_contents("https://confluence.translate5.net/display/TAD/EventCodes"); preg_match_all("/(E1[0-9]{3})/", $text, $codes); print_r(max(array_unique($codes[0])));echo "\n";'

or to get a whole list sorted from lowest to highest:
php -r '$text = file_get_contents("https://confluence.translate5.net/display/TAD/EventCodes"); preg_match_all("/(E[0-9]{4})/", $text, $codes); $codes = array_unique($codes[0]); sort($codes); print_r($codes);echo "\n";'